SkakashiS This is the original extension; the other you linked is a fork - I have no idea what the fork changed/fixed or did. (It appears to be adding in some lottery system; no idea what the end game is but it goes beyond just fixing issues ๐คจ)
It links to this post, which seems fairly normal for more than a handful of forks (one of the reasons I'm not a fan of the way they do the extensions database for Flarum).
Askvortsov hasn't put out a release since 2023, and so far as I recall, he's busy with studies or work (I forgot which). Either way, he has not been around for some time (at least in the public Flarum space), which is a bit of a shame; he had some of the most curious extensions.
Either way, you would be using either version at your own risk (as with anything open source related). Do your due diligence and test any extension(s) against a test forum rather than your public one.